On Offer: 1.818g Aubrite achondrite meteorite fragment

Name: NWA 13304

Type: Aubrite

Description: An amazing 1.818 gram achondrite meteorite fragment that comes from an unknown parent body.

The aubrite class of achondrite meteorite is a very rare differentiated meteorite comprised mostly of the mineral enstatite. While we have sufficient (over 3) examples of these meteorite types to give them their own class, we still don't know what massive differentiated parent body they come from.

Not to be confused with the undifferentiated EH and EL chondrites, these enstatite rich achondrites come from a much larger differentiated parent body, and are far more rare.

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Northwest Africa 13304

Basic information

Name: Northwest Africa 13304
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13304
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass: 263 g

Classification
history:

Recommended:

Aubrite [explanation]

This is 1 of 65 approved meteorites classified as Aubrite. [show all]
Search for other: Achondrites, Aubrites, Enstatite achondrites, and Enstatite-rich meteorites

Comments:

Approved 23 May 2020

Writeup

Writeup from MB 109:

Northwest Africa 13304 (NWA 13304)

Northwest Africa

Purchased: 2019

Classification: Enstatite achondrite (Aubrite)

History: Two fragments of ~23 g purchased by Dustin Dickens October of 2019 in Morocco from Mohamed Amouri. Dustin later received an additional ~24 0g stone from Hammi in February of 2020 at the Tucson gem and mineral show.

Physical characteristics: Exterior has dark colored fusion crust patches. Saw cuts and broken surfaces reveal a breccia of fragmented white pyroxene grains, some up to several mm in size, set in a fine-grained matrix. Scattered brown-orange colored, oxidized metal grains are visible throughout.

Petrography: (C. Agee, UNM) This meteorite consists primarily of larger fragmental enstatite and diopside grains nested in a fine-grained, cataclastic matrix of enstatite and diopside. Kamacite, troilite, alabandite, and daubreelite were detected. Olivine and plagioclase were not detected.

Geochemistry: (C. Agee, UNM) Enstatite Fa_0.1±0.1Wo_1.3±0.3, n=5; diopside Fs_0.0±0.0Wo_42.1±4.7, n=2. Oxygen isotopes (K. Ziegler, UNM): 3 acid-washed fragments analyzed by laser fluorination gave δ¹⁸O= 5.511, 5.608, 5.742; δ¹⁷O= 2.868, 2.924, 3.004; Δ¹⁷O= -0.042, -0.037, -0.028 (linearized, all per mil, TFL slope=0.528).

Classification: Aubrite

Specimens: 20.1 g including a probe mount on deposit at UNM, Dustin Dickens holds the main mass.

Data from:
  MB109
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2019
Mass (g):	263
Pieces:	3
Class:	Aubrite
Shock stage:	moderate
Weathering grade:	low
Ferrosilite (mol%):	0.1±0.1, 0.0±0.0
Wollastonite (mol%):	1.3±0.3, 42.1±4.7
Classifier:	C. Agee, UNM
Type spec mass (g):	20.1
Type spec location:	UNM
Main mass:	Dustin Dickens
Comments:	Field name DD-61; submitted by C. Agee, UNM